print("%5.1f" % (9 / 5))
num1 = 11
num2 = 11.345
print("数字11的宽度限制是5，结果：%5d" % num1)
print("数字11宽度限制是1，结果：%1d" % num1)
print("数字11.345宽度限制是7，小数精度是2，结果：%7.2f" % num2)
print("数字11.345不限制宽度是，小数精度是2，结果是：%.2f" % num2)

name = "IT黑马"
set_up_year = 2006
stock_price = 19.99

print(f"我是{name},我成立于{set_up_year},我现在的股价是{stock_price}")


